Not only did the Prolecanitida evolve their sutures differently than in the Goniatitda, by increasing the number of umbilical lobes rather than by subdivision of the lateral saddle, their body chambers were short by comparison. This brings up the question of, just how closely related were the Prolecanitida and their Mesozoic descendants to the goniatitids in the first place.

Not only did the Prolecanitida evolve their sutures differently than in the Goniatitda, by increasing the number of umbilical lobes rather than by subdivision of the lateral saddle, their body chambers were short by comparison. This brings up the question of, just how closely related were the Prolecanitida and their Mesozoic descendants to the goniatitids in the first place.